Create letter template without db

app/controllers/template_previews_controller.rb

@@ -0,0 +1,63 @@
+class TemplatePreviewsController < ApplicationController
+  skip_before_action :authenticate_user!
+  skip_after_action :verify_authorized
+
+  def index
+    @templates = SnailMail::Components::Registry.available_templates
+  end
+
+  def show
+    template = params[:id]
+    include_qr_code = params[:qr].present?
+
+    mock_letter = create_mock_letter
+
+    pdf = SnailMail::PhlexService.generate_label(mock_letter, { template:, include_qr_code: })
+    send_data pdf.render, type: "application/pdf", disposition: "inline"
+  end
+
+  private
+
+  def create_mock_letter
+    return_address = OpenStruct.new(
+      name: "Hack Club",
+      line_1: "15 Falls Rd",
+      city: "Shelburne",
+      state: "VT",
+      postal_code: "05482",
+      country: "US",
+    )
+
+    names = [
+      "Orpheus",
+      "Heidi Hakkuun", 
+      "Dinobox",
+      "Arcadius",
+      "Cap'n Trashbeard",
+    ]
+
+    usps_mailer_id = OpenStruct.new(mid: "111111")
+    sender, recipient = names.sample(2)
+
+    OpenStruct.new(
+      address: SnailMail::Preview::FakeAddress.new(
+        line_1: "8605 Santa Monica Blvd",
+        line_2: "Apt. 86294", 
+        city: "West Hollywood",
+        state: "CA",
+        postal_code: "90069",
+        country: "US",
+        name_line: sender,
+      ),
+      return_address:,
+      return_address_name_line: recipient,
+      postage_type: "stamps",
+      postage: 0.73,
+      usps_mailer_id:,
+      imb_serial_number: "1337",
+      metadata: {},
+      rubber_stamps: "here's\n where\n rubber stamps go!",
+      public_id: "ltr!PR3V13W",
+    )
+  end
+end

app/views/template_previews/index.html.erb

@@ -0,0 +1,22 @@
+<% content_for :title, "Template Previews" %>
+
+<div class="max-w-4xl mx-auto p-8">
+  <h1 class="text-3xl font-bold mb-8">Letter Template Previews</h1>
+
+  <div class="grid gap-4">
+    <% @templates.each do |template| %>
+      <div class="border rounded-lg p-4 bg-white shadow-sm">
+        <h2 class="text-xl font-semibold mb-2"><%= template.to_s.split("::").last.humanize %></h2>
+        <p class="text-gray-600 mb-4 font-mono text-sm"><%= template %></p>
+        <div class="flex gap-3">
+          <%= link_to "Preview PDF", template_preview_path(template), 
+              target: "_blank", 
+              class: "bg-blue-500 hover:bg-blue-600 text-white px-4 py-2 rounded" %>
+          <%= link_to "Preview with QR", template_preview_path(template, qr: true), 
+              target: "_blank", 
+              class: "bg-green-500 hover:bg-green-600 text-white px-4 py-2 rounded" %>
+        </div>
+      </div>
+    <% end %>
+  </div>
+</div>

config/routes.rb

@@ -705,5 +705,6 @@ def self.matches?(request)
   # root "posts#index"
   if Rails.env.development?
     mount LetterOpenerWeb::Engine, at: "/letter_opener"
+    resources :template_previews, only: [:index, :show], path: "previews/templates"
   end
 end